ReferenceType.locationsOfLine(int lineNumber) should throw
InvalidLineNumberException if there is no executable code
associated with the given line.
Method tested with following line numbers.
1. valid number.
2. negative value(-100)
3. line number of a comment line.
4. line number of a blank line.
For all the above values only empty list is returned and
InvalidLineNumberException is not thrown.

Testing done in JDK1.3.0-S build-Classic and Hotspot VMs.

 Steps to reproduce the bug
 ---------------------------
 1)Set path to latest JDK
 2)Compile the attached files with -g option
 3)Start the targetVM with the command
 java -Xdebug -Xnoagent
 -Xrunjdwp:transport="dt_socket",server=y,suspend=y,address=5670 TypeTest
 4)Start the debugger with the command
 java LineTest

 Attachments:
 ------------
 1. JDIScaffold.java
 2. VMConnection.java
 3. LineTest.java
 4. TypeTest.java